Enjoying cinema

peace,
If there is a movie I’m interested in at the cinema. The cinema is open on Shabbat. I see the movie after Shabbat, is there a problem here?
The cafeteria probably doesn’t have a kosher certificate because it’s open on Shabbat, but what it sells is popcorn, sodas, ice cream, and chocolates. Do you think it’s permissible to buy from them?